KR20130056557A - Cross flow fan and air conditioner - Google Patents

Abstract

PURPOSE: A tangential fan and an air conditioner are provided to reduce the generation of a vortex and to increase a volume of the air becoming discharged, thereby improving the efficiency of the tangential fan. CONSTITUTION: A tangential fan comprises a disc type fixed member and a plurality of blades(110). The blades are fixed on the top surface of the fixed member and arranged by being spaced to a circumferential direction. Protrusions protruded to a direction of the underside of the fixed member are formed in one end of each blade. The protrusions are formed in outer edges(111) of the blades.

Description

Cross flow fan and air conditioner

The present invention relates to a crossflow fan and an air conditioner.

In general, an air conditioner is a device for cooling or heating an indoor space. The air conditioner includes a compressor for compressing a refrigerant, a condenser for condensing the refrigerant discharged from the compressor, an expander for expanding the refrigerant passing through the condenser, and an evaporator for evaporating the refrigerant expanded in the expander.

The condenser and the evaporator of the air conditioner are heat exchangers for heat exchange between the refrigerant and the outside air, and are provided in an indoor unit or an outdoor unit. At this time, one side of the heat exchanger provided in the indoor unit, the cross flow fan may be disposed.

The crossflow fan is provided with a plurality of blades in the disc, and discharges air sucked in the radial direction in the radial direction. That is, the cross flow fan may suck outside air into the indoor unit, exchange heat with the refrigerant flowing in the heat exchanger, and then discharge the outside air to the outside of the indoor unit.

However, as the cross flow fan used in the related art generates a vortex in the flow of air discharged by the blade during the rotation, noise and vibration are transmitted to the room, thereby making the user feel uncomfortable. There is a problem. In addition, there is a problem in that the efficiency of intake and discharge of air is lowered due to the vortex, which may lower the overall performance of the air conditioner.

It is an object of the present invention to provide a crossflow fan and an air conditioner by providing protrusions on the outer edge of the blade, which can reduce noise and increase discharge efficiency.

Cross-flow fan according to one aspect, the fixing member in the form of a disk; It includes a plurality of blades fixed to the upper surface of the fixing member, spaced apart in the circumferential direction, one end of each blade is formed with a projection (projection) protruding in the lower surface direction.

An air conditioner according to another aspect includes a heat exchanger formed inside the case; A cross-flow fan disposed on one side of the heat exchanger and including a plurality of blades; And a flow path guide disposed near an outer circumferential surface of the cross flow fan, and protrusions protruding in a lower surface direction are formed at outer edges of the respective blades.

According to the present invention, the protrusions protruding from the outer edge of the blade toward the lower surface of the blade can reduce the generation of vortices and increase the flow rate of the discharged air, thereby improving the efficiency of the cross flow fan.

In addition, according to the present invention, by forming a curved surface of the protrusion facing toward the outside of the crossflow fan, it is possible to prevent the suction flow rate is lowered when the air is sucked by the blade.

According to the present invention, a plurality of protrusions are provided on the outer edge of the blade to weaken the strength of the vortex in the discharge area of air, and the protrusions are coupled to the outer edge and the protrusion of the blade to secure a sufficient thickness. By making it possible, the durability of a projection part can be improved.

1 is a cross-sectional view of an air conditioner according to a first embodiment of the present invention.
2 is a perspective view of a blade according to the first embodiment of the present invention;
3 is a partially enlarged view of FIG. 2;
4 is a graph showing a comparison of the performance of the cross-flow fan according to the first embodiment of the present invention and the prior art.
5 is a perspective view of a blade according to a second embodiment of the present invention.
6 is a partially enlarged view of Fig.
7 is a perspective view of a blade according to a third embodiment of the present invention.
8 is a partially enlarged view of FIG. 7;
9 is a graph showing a comparison of the performance of the cross-flow fan according to the third embodiment of the present invention and the prior art.
10 is a view showing the flow of air in the blade according to the third embodiment of the present invention.

Hereinafter, the crossflow fan and the air conditioner according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a cross-sectional view of an air conditioner according to a first embodiment of the present invention.

Referring to FIG. 1, the air conditioner 1 according to the first embodiment of the present invention includes a case 10, a heat exchanger 20, a fan 100, and a flow path guide 30. In this case, the air conditioner 1 may mean an indoor unit.

The case 10 may have a front suction part 11 formed at a front side, and an upper suction part 12 formed at an upper side thereof. The front suction part 11 and the upper suction part 12 may be provided with a filter 13 for filtering the air sucked. The filter 13 may be disposed at the front and the upper side of the case 10 to cover the front suction part 11 and the upper suction part 12. In this case, the filter 13 may be fixed or detachably installed at the front of the case 10.

In addition, the case 10, the air discharge portion 14 may be formed on the lower side. The air discharge part 14 may be provided with a discharge louver 15 for adjusting the discharge direction of the air. The discharge louver 15 may be controlled to close the air discharge port 14 by closing when the air conditioner 1 is stopped.

The heat exchanger 20 is disposed inside the case 10 to allow the outside air and the refrigerant to exchange heat. The heat exchanger 20 may be a fin tube heat exchanger including a refrigerant tube through which a refrigerant flows and a plurality of heat exchange fins through which the refrigerant tube passes.

The heat exchanger 20 is disposed to surround the suction side of the fan 100. For example, the heat exchanger 20 includes a plurality of bent heat exchangers 21, 22, and 23, and the heat exchangers 21, 22, and 23 are arranged to surround the suction side of the fan 100. do. Therefore, the present embodiment can increase the heat exchange capacity by providing a relatively large heat exchanger 20 in the same space. Of course, the heat exchanger 20 may be formed as an integral bent shape.

Air introduced through the front and upper suction parts 11 and 12 passes through the heat exchanger 20. Specifically, the air introduced into the case 10 may pass through the heat exchange parts 21, 22, and 23, and may be cooled or heated by heat exchange with a refrigerant flowing along the refrigerant tube. Thereafter, the cooled or heated air is discharged into the room through the air discharge unit 14 to create a room in an environment desired by the user.

The fan 100 is disposed on one side of the heat exchanger 20. The fan 100 may be a cross flow fan 100 that discharges radially sucked air in a radial direction.

The crossflow fan 100 is composed of a plurality of fan units (not shown) in the longitudinal direction. Each fan unit includes a fixing member 120 having a disc shape, and a plurality of blades 110 fixed to an upper surface of the fixing member 120 and arranged in a circumferential direction. That is, the crossflow fan 100 has a form in which a plurality of blades 110 are arranged along the circumferential direction. The blade 110 of the crossflow fan 100 will be described in detail later.

The flow guide 30 is disposed near the outer circumferential surface of the cross flow fan 100 to guide the flow of air. That is, the flow guide 30 smoothly guides air intake and discharge of the cross flow fan 100. The flow guide 30 may include a rear guide 31 and a stabilizer 32.

The rear guide 31 extends from the rear side of the case 10 to the suction side of the cross flow fan 100. The rear guide 31 allows the intake air to be smoothly guided to the crossflow fan 100 when the crossflow fan 100 is rotated. In addition, the rear guide 31 may minimize the separation of air flowing by the crossflow fan 100 from the crossflow fan 100.

The stabilizer 32 is disposed on the discharge side of the cross flow fan 100. The stabilizer 32 is installed to be spaced apart from the outer circumferential surface of the cross flow fan 100 to prevent the air discharged from the cross flow fan 100 to flow back to the heat exchanger 20 side.

The rear guide 31 and the stabilizer 32 are disposed along the longitudinal direction of the cross flow fan 100. In addition, the rear guide 31 and the stabilizer 32 are installed to be spaced apart from the outer circumferential surface of the crossflow fan 100 by a predetermined interval.

When the cross flow fan 100 is rotated, air is sucked through the front and upper suction parts 11 and 12, and the sucked air is then heat-exchanged with the refrigerant while passing through the heat exchanger 20. It flows to the (100) side. At this time, the air can be sucked smoothly by the rear guide (31).

Thereafter, the cross flow fan 100 flows air from the rear guide 31 side to the discharge part side. At this time, since the air discharged from the crossflow fan 100 is prevented from flowing into the heat exchanger 20 by the stabilizer 32, the air of the air discharge unit 14 may be smoothly discharged to the indoor space. have.

FIG. 2 is a perspective view of a blade according to the first embodiment of the present invention, and FIG. 3 is a partially enlarged view of FIG. 2.

2 and 3, in the blade 110 of the crossflow fan 100 according to the first embodiment of the present invention, a line connecting the length direction of each of the blades 110 is called a span (S). The height of the blade 110 perpendicular to the span S is defined as a chord C. In addition, the inner end formed along the length (span S) direction of the blade 110 is defined as an inner edge 111, and along the length (span S) direction of the blade 110. The formed outer tip is defined as an outer edge 112.

When the blade 110 is installed in the cross flow fan 100, the inner edge 111 faces the inside of the cross flow fan 100, and the outer edge 112 faces the outside of the cross flow fan 100. In this case, cross sections of the inner edge 111 and the outer edge 112 may be rounded. In addition, the inner edge 111 of the blade 110 may be formed substantially parallel to the axis of rotation of the crossflow fan (100).

In addition, the blade 110 may have a shape in which the thickness of the inner edge 111 and the thickness of the outer edge 112 are different. That is, the blade 110 may have a shape in which the thickness gradually decreases from the inner edge 111 to the outer edge 112.

At one end of each blade 110, a protrusion 113 protruding in the lower surface direction is formed, it is possible to reduce the generation of vortex during the discharge of air. The protrusion 113 may be formed at the outer edge 112 of the blade 110 and may extend in the longitudinal direction of the blade 110.

In this case, the sum of the thickness of the outer edge 112 and the protrusion thickness of the protrusion 113 may be equal to the thickness of the inner edge 111. This is for the smooth intake and discharge of air flow.

When air passing through the center of the crossflow fan 100 flows along the lower surface of the blade 110, vortices may occur in the flow of air located between the flow path guide 30 and the blade 110. In this case, the protrusion 113 provided in the blade 110 can suppress the irregular flow of air due to the vortex by disassembling the vortex small. Therefore, the blade 110 may allow the air introduced through the front and upper suction parts 11 and 12 to be discharged along the air discharge part 14 smoothly, thereby increasing the discharge flow rate.

In this case, the outer surface 113a of the protrusion 113 facing the outside of the crossflow fan 100 may be smoothly connected to the outer edge 112 surface of the blade 110. That is, the outer surface 113a of the protrusion 113 may be connected to the outer edge 112 surface of the blade 110 in a curved shape. This is to prevent the intake flow rate of the air from falling by the protrusion 113 when the air is sucked through the outer surface 113a of the protrusion 113.

On the other hand, the inner surface 113a of the protrusion 113 facing the inner side of the crossflow fan 100 may have a planar shape inclined at an angle with the lower surface of the blade 110. In this case, an angle formed between the inner surface 113a of the protrusion 113 and the lower surface of the crossflow fan 100 may be an acute angle.

When the inner surface 113a of the protrusion 113 has the shape described above, when air flows along the outer edge 112 of the blade 110, the lower surface of the blade 110 and the protrusion 113 are formed. Vortex can be generated in the space between them. Of course, the protrusion 113 may reduce the vortex when discharging air. That is, the protrusion 113 may reduce the vortices in the discharged air and generate vortices in the inflowed air. However, since the discharge speed is faster than the inflow rate of air, even if the protrusion 113 generates the vortex in the suction region, the overall efficiency can be sufficiently increased by adjusting the vortex generated in the discharge region.

4 is a diagram illustrating a graph comparing the performance of the cross-flow fan according to the first embodiment of the present invention and the prior art. In FIG. 4, the vertical coordinate is a flow rate, and the horizontal coordinate is a static pressure. In this case, the conventional art to be compared means a crossflow fan 100 using a general blade 110 having no protrusion 113. In Figure 4, the driving RPM of the prior art and the present embodiment is the same state, the present embodiment is indicated by a solid line and the prior art is indicated by a dotted line.

Referring to FIG. 4, the crossflow fan 100 according to the first embodiment of the present invention shows a higher static pressure at the same flow rate and a higher flow rate at the same static pressure as compared with the prior art. That is, in this embodiment, compared to the prior art, by controlling the vortex in the discharge area by using the protrusion 113, it is possible to improve the flow rate and the static pressure performance as a whole.

5 is a perspective view of a blade according to a second exemplary embodiment of the present invention, and FIG. 6 is a partially enlarged view of FIG. 5.

5 and 6, the blade 110 according to the second embodiment of the present invention, like the first embodiment, the protrusions protruding in the lower surface direction to the outer edge 112 of the blade 110 ( 113). Unlike the first embodiment, however, in the second embodiment, the protrusion 113 may have a curved surface convex in the lower surface direction of the blade 110. This is to reduce the occurrence of vortex in the suction area.

Of course, the outer surface 113b of the protrusion 113 may be connected to the outer edge 112 of the blade 110 in a curved form as in the first embodiment. In the present embodiment, when both the inner surface 113a and the outer surface 113b of the protrusion 113 are formed in a convex curved shape in the lower surface direction of the blade 110, the vortex in the discharge region when compared with the first embodiment The effect of decomposing the gas is reduced, while the amount of vortices generated in the suction area can be reduced.

7 is a perspective view of a blade according to a third exemplary embodiment of the present invention, and FIG. 8 is a partially enlarged view of FIG. 7.

7 and 8, the outer edge of each blade according to the third embodiment of the present invention, the protrusion 113 protruding in the lower surface direction and a plurality of protruding in the outer direction of the crossflow fan 100 Protrusions 114 may be formed. At this time, the protrusion 113 may have the form of the first embodiment as shown in the figure, of course, this embodiment does not limit the shape of the protrusion 113 as described above.

The protrusion 114 may reduce the strength of the vortex in the flow of air discharged from the cross flow fan 100, thereby increasing the flow rate and reducing the noise. The plurality of protrusions 114 may be spaced apart at regular intervals in the longitudinal direction of the blade 110.

In this case, an end portion of the protrusion 114 may have a curved shape. This is to prevent air from being resisted by the protrusion 114 when air is introduced into the blade 110.

The protrusion 114 may have a rectangular shape when viewed from the top or bottom surface of the blade 110. In more detail, the protrusion 114 may have a trapezoidal shape in which a width thereof becomes narrower toward an end portion. This is to prevent the flow of air flowing into the cross-flow fan 100, as in the form of the outer surface of the protrusion 114. In addition, the protrusion 114 may be in the form of decreasing thickness toward the end.

The thickness of one end of the protrusion 114 attached to the blade 110 is greater than or equal to the thickness near the outer edge 112, and the thickness near the outer edge 112 and the protrusion of the protrusion 113. It may be less than or equal to the sum of the thicknesses. At this time, the thickness near the outer edge 112 means the thickness of a portion away from the outer edge 112 in the inward direction of the crossflow fan 100.

According to the present exemplary embodiment, since the protrusion 113 is disposed on the lower surface of the blade 110, a portion of the outer edge 112 of the blade 110 may be thicker than that of the general blade 110. In this case, since the protrusion 114 may be coupled to the outer edge 112 and the protrusion 113, the thickness of the protrusion 114 may be thicker by the thickness of the protrusion 113 than the thickness of the vicinity of the outer edge 112. have. That is, in the present embodiment, the coupling strength of the protrusion 114 may be improved by expanding the coupling area of the protrusion 114 and the blade 110 through the protrusion 113.

9 is a graph showing a comparison of the performance of the cross-flow fan according to the third embodiment of the present invention and the prior art. In Figure 9 (a) the vertical coordinate is the RPM of the motor driving the fan, the horizontal coordinate is the flow rate. In FIG. 9B, the vertical coordinate is a flow rate and the horizontal coordinate is a noise. In FIG. 9B, the driving RPM of the prior art and the present embodiment is in the same state. In addition, the prior art in FIG. 9 refers to the crossflow fan 100 using the general blade 110 without the protrusion 113 or the protrusion 114 as shown in FIG. In FIG. 9, the present embodiment is indicated by a solid line and the prior art is indicated by a dotted line.

Referring to FIG. 9, the crossflow fan 100 according to the third embodiment of the present invention may secure a higher flow rate than the prior art when driven at the same RPM. This means that it is sufficient to drive at a lower RPM than the prior art to secure a constant flow rate. Therefore, the present embodiment can reduce power consumption by about 5%.

In addition, in the present embodiment, when the same flow rate is ensured, the generation of noise can be lowered than in the prior art. Therefore, in the present embodiment, when a constant flow rate is sucked and discharged, the noise generated in the flow of air can be reduced, thereby improving user satisfaction.

10 is a view showing the flow of air in the blade according to the third embodiment of the present invention.

Referring to FIG. 10, in the blade according to the third embodiment of the present invention, when air is discharged, vortices flowing along the top surface of the blade 110 and vortices flowing along the protrusion 114 span (S). A plurality of are generated in the direction of). At this time, the vortex flowing along the upper surface of the blade 110 and the vortex flowing along the protrusion 114 may be offset because they rotate in opposite directions. Therefore, in this embodiment, by using the protrusion 114 to reduce the overall strength of the vortex, it can increase the flow rate and reduce the noise.

1: air conditioner 10: case
11: front suction part 12: upper suction part
13: filter 14: air discharge part
15: discharge louver 20: heat exchanger
21, 22, 23: heat exchanger 30: flow path guide
31: Rear guide 32: Stabilizer
100: cross flow fan 110: blade
111: inner edge 112: outer edge
113: protrusion 113a: outer surface of the protrusion
113b: inner surface of protrusion 114: protrusion
120: Fixing member

Claims (11)

A stationary member in the form of a disc; And
A plurality of blades fixed to an upper surface of the fixing member and arranged spaced apart in the circumferential direction,
One end of each of the blades, cross-flow fan, characterized in that the projecting portion projecting in the lower surface direction. The method of claim 1, wherein the protrusion,
Cross-flow fan, characterized in that protruding from the outer edge of the blade. The method of claim 1,
The outer surface of the protrusion facing toward the outside of the cross flow fan, the cross flow fan, characterized in that it is smoothly connected to the outer edge of the blade. The method of claim 3, wherein
The outer surface of the protrusion, cross-flow fan, characterized in that connected to the outer surface of the outer surface of the blade. The method of claim 1,
The inner surface of the protrusion facing toward the inner side of the cross flow fan is a cross flow fan, characterized in that the plane inclined at an angle with the lower surface of the blade. The method of claim 5, wherein
An angle formed between an inner surface of the protruding portion and a lower surface of the cross flow fan is an acute angle. The method of claim 1, wherein the protrusion,
Cross-flow fan characterized in that the curved surface convex in the lower surface direction of the blade. The method of claim 1, wherein the blade,
Crossflow fan, characterized in that the thickness is reduced from the inner edge to the outer edge. The method of claim 8,
The sum of the thickness of the outer edge and the protruding thickness of the protrusion is equal to the thickness of the inner edge. A heat exchanger formed inside the case;
A cross-flow fan disposed on one side of the heat exchanger and including a plurality of blades; And
A flow path guide disposed near an outer circumferential surface of the cross flow fan,
The outer edge of each blade, the air conditioner, characterized in that the protrusion projecting in the lower surface direction. 11. The method of claim 10,
The outer surface of the protrusion facing toward the outside of the crossflow fan, the air conditioner, characterized in that connected to the outer surface of the outer surface of the blade in a curved form.

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